Sensitive Information Exposure in Gravity SMTP for WordPress REST API
The Gravity SMTP plugin for WordPress is vulnerable to sensitive information exposure in all versions up to and including 2.1.4. The issue is caused by a REST API endpoint at /wp-json/gravitysmtp/v1/tests/mock-data being registered with a permission_callback that unconditionally returns true, allowing unauthenticated access. When the query parameter ?page=gravitysmtp-settings is appended, the plugin's register_connector_data() method populates internal connector data and the endpoint returns roughly 365 KB of JSON containing the full System Report. Exposed information includes the PHP version, loaded extensions, web server version, document root path, database server type and version, WordPress version, active plugins and their versions, active theme, WordPress configuration details, database table names, and any API keys or tokens configured in the plugin.
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